Sewing machine



H. PERRAS SEWING MACHINE Filed May 51 2\SheetS-Sheet l INVENTOR l HA RM/DOS PERRAS ATTQRNEY s 2. z m ..Y. 3 t Rm N 9 e OP R 0 a N T 7 ES T 4 s V0 A. 1, w mw.

SW1 AH. mm, Rc1 n ,w RMN EGa PWM w d www W hb Patented Oct. 16, 1923;

Lhassa Arum .orfIC HARMIDOS PERRAS F DAYVILLE, CONNECTICUT.

SEWING MACHINE.

Application med May 31, 1921. serial No. 474,041.

To all whom t may concern p Be it known that I, HAnMmos Pancras, a citizen of the United States, residing at Dayville, in the countykk of Windham 'and State of Connecticut, have invented certain .new and useful Improvements in Sewing' Machines, of which the following isaspecication. s

MThis invention relates to improvements in sewing machines and has particular reference to machines intended for use in the stitching of bufling wheels or similar structures in which it is desired to unite members by stitching them in a plurality of rows substantially circular in form to tightly bind them into a substantially solid body. y 4

One ofthe principal objects of the presentinvention is the provision in a machine of the general character set forth of novel and improved mechanism for automatically controlling the feed or movement of the work during the switching operation.

A further object of they invention is the provision of a device of this rcharacter which while operated Eby. the machine head is entirely independent thereof and capable ofuse-with any .standard type of sewing machine. y

Another object; of the invention is the provision of.y a bud wheel guiding and shiftf ing attachment for sewing machines which shall be rigid and substantial in construetion, in which undue play of the partsshall be eliminated and the wheel positively and continuously fed in a decreasing. convolute or spiral path but in which friction is reduced to a minimum so that verylittle power is required for the proper operationthereof.

Other objects and advantages of my im# parentv by reference to the followingspeci# fication taken' in connection with the accompanying drawings, and it will be under# stood that I may make any modifications r in the specific Ydetails. of construction shown and described within the scope ofri'L-heap` pendedV claims withoutA departingfrom or exceeding the-spirit'of my invention. y

5 Figure `I represents a front view of a machineequipped with my improvements,

parts being broken away.V y

Figure II represents a plan view thereof. Figure III representsan yenlargedl sectional view as on the line IIIe-III of Figk ure I.

proved construction should be readily ap-A IFigure IV represents a sectional view on the' line IV-IV of Figure I, and,

Figure V-.represents a section as on the line V-'V'ofr Figure I illustrating a positive drive for the'feed mechanism. Y'

Figure VI represents a fragmentary view illustratingan adjustment of the mecha` nism for finish-stitching of the center of the wheel.

In the drawings, in which similarchan acters of reference are employed to denote corresponding parts throughout the several views, the numeral l designatesy the legs or supports for the bed 2 which servesto support any suitable Ltype of sewing machine for use in connection with my improved buffer wheel feeding mechanism. As the no part of the presentJ invention I have only semi-diagrammatically illustrated the same as comprising the head 3 carrying the driven shaft l provided with the tight pulley`5 and loose pulley 6 over which the belt 7 isselectively shifted to control the opera tion of thehead. Said head is further pro` vided with the usual needle S suitablv operatedand with .the feed mechanism 9 oper'- ating the lpusher foot l0 intended to feed the. work along under the needle.

My improvement is adapted for use in connection with any standard machine yof this type and consists Lof mechanism for holding an assembled buiiing wheel or the like consisting of a number of fabric layers intended to be united by spiral or circular rows of stitching, ther purpose of my inven` structure of the sewing machine itself forms z tion as previously set forth being to so'hold v the fabric' that it will Vbe automatically advanced as the machine is operated to cause the stitching to be in the form of a con volute or spiral .constantly decreasing Ain size from edge substantially to the lcenter of the f wheel.V

In the `accomplishn'ient of this result l. form on the bed 2 the guide-ways `r1l suitv ably undercut so that the ,slide l2 will lic with its yupper face flushrwith that of the bed. This slide carries the rotatable sleeve or bushing having the toothed or ratchet vportionlto receiveand grip the buff wheel 17 held in place asby the washer l5 and clamp nut or member 1G. On its otherend `belowthe` slide l2 the sleeve has the gear 18 in mesh with the spur pinion 19 having the ksecond bevel or mitre gear vportion 2O meshing with the second mitre gear 21, the combined spur and mitre gear member being rotatably mounted on the stud 22 depending from the slide 12.

The gear 21 is secured on the sleeve 23 which is rotatable in the dependinglugs or hangers 24 of the slide 12, having eXteriorly secured thereon as by the set screw 25 the worm 2G and interiorly receiving the kguide rod 27 on which it slides. is one ofthe important features of the present invention, in that by` its use it is possible to insure firm and steady supporting of the slide and associated parts and eliminate all possibility of bindingV or the like so that a minimum of power is required to properly operate the feed, making it thoroughly feasible to depend on the normal action of the ordinary feed of thesewing machine to cause the spiral advance of the material to be stitched. This rod in the. form illustrated in*Y Figure I for example is rigidly secured to the underside of the bed as in the hangers 28, altho it is to be understood that as hereinafter described in connection with Figure V it may be rotatable if preferred. f

In any event, however, the sleeve 23 is what may be termed a loose or sloppy fit on the rod or shaft so that it may slide freely therealong wit-hout binding. This sliding action is caused by the engagement of the worm 2G with the rack 29 carried by the rotatable rod 30 also preferably mounted in the hangers 28 and capable of being rocked by the handle 31 to throw it down into engagement with thev worm as shown in Figure III or into raised and disengaging positionas shown in Figure IV. In the latter case, the slide may be freely shifted into any desired position on the bed, except as limited by the adjustable stop collar 32 ou the rod 27.

In operation, the machine is set up with the rack raised and theslide so shifted'as to bring the edge of the buff wheel 17 in proper relation to the needle 8 for the first row of the stitching. This positionv having been determined the collar 32 is adjusted f and secured in proper position on the rod 27 toV serve as 'a stop against which the slide is to be brought when starting on other similar wheels. The memberV 30 is `then rocked to bring the rac-k Vand worm in mesh and the belt shifter 33 moved to throw the belt 5 onto the fixed pulley of the machine to start it intooperation. As the machine operates, the rearward movement of the wheel caused bythe normal actionfof the feed 10 on account of the pivotal mounting of the wheel on the slide 12 will turnL the supporting sleeve and thus through the gear ing the worm 26, which is shown as having a left hand thread, The rotation of the worm will on account of its engagement This guide rod y with the rack feed the slide forward, the slide moving on the bed 2 but being steadied and guided by the rigid rod or 'shaft 27 with which the sleeve 28 has a loose sliding engagement. The result is that the stitching of the wheel will be in the form of a spiral, the ratio of the gearing controlling the distance between the adjacent rows of stitching. j j

To automatically stop the operation of the machine when the wheel is completed, I make use of a suitable automatic control such as the spring 3e tendingto throw'the belt shifter toward the loose pulley 6, a suitable slide frame 35 having ay latch portion 36 engaged by the keeper 37 normally holding the shifter in place 'against the pressure of the spring. This keeper, however,;is formed with the release armBS engaged by vthe trip 39 on the hanger or bracket 24 of the slide'12. This trip is secured in adjusted position as by the screw 40 so that it will trip or shift the arm 38 to unlatch the keeper 37 as the wheel reaches its inner limit of movement and so through the shifting of the belt, stop the operation of the machine when the slide can be manually shifted back against the stop 32,l the completed wheel removed and the parts be in position 4toystart stitching a new one.

WhileI vhave particularly described my invention as operating merely by the turning movement imparted tothe buff wheel by the feed of the sewing machine, it is to be understood that my device can be used with la positive drive. without material modification. In this event, as shown in Figure V it is merely necessary to attach to the feeding foot 10 ak pawl or the like 41 co-operating with the ratchet 42 secured on the rod or shaft 27 which is then rotatably held in its bearings `against axial movement, while the worm mechanism is keyed 'in the groove 43, being driven around by the slow turning of the rod but sliding alongit and rotating with the wheel as before, the differencebeing that the worm then drives the `wheel in place 'of the wheel turning the worm.

j the construction and operation of my improved mechanism should be readily understood and it will be seen that I have provided a new and desirable buff wheel feeding device which may be either driven `by the turning of the wheel itself or ,positively driven, in which a satisfactory means is provided for steadyingfthe feed slide and insuring its propel` movement without binding or wabbling, in which the several parts are vso mounted and secured as to be readily` accessible for adjustment and so held as to be readily removed and replaced as required. It will be further noted that the arrangement of the gearing is such that ioo l.eoaiiam ythe buff wheel may be fed'with" its center right up to thek needle withoutthe 'gearing in any way interfering with the feed orf other parts, and also that I have provided an improved machine in which the only and a device which is not dependent ona particular make of machine but which is capable of use with any type of sewing machine so long as it is mounted on a be adapted to carry the attachment.

I would call especial attention to the removability of the parts of the machine and to the fact that to Vchange the entire slide it is only necessary to loosen and slide out the rod 27 when the remainder of the parts can be lifted out through the enlarged'i portion 44 of the guideway ll and a new slide put in place.

A further pointof advantage in connection with my improvement resides in the fact that it may if preferred be used to place one or more circular rows at the center of the wheel automatically. If desired to perform this operation automatically the stop .is raised into inoperative position and the rack 29 set as shown in Figure VI so that the worm will run off 'the end of the rack and hold the wheel over into center position to form the stitching at the center there illustrated. This adjustment of :the rack is controlled b-y the collar 46 on the rack bearing rod 30, the collar being locked in adjusted position by a suitable set screw. This adjustment makes it possible for the rack to be set in so that the slide will be fed forward till the stop operates to stop the entire machine or may be shifted toward the left so that the worm will run off the rack and the wheel continue stitching till the operator stops the machine, or the stop may be employed in the later form when the 'stop will be set tov operate as the rack and worm are just moving out of engagement, in this instance the disengagment of the drive of the slide preventing any possibility of the wheel clamp and parts being forced under the needle of the machine and breaking any of the parts in the event that the stop is not correctly set or for-any reason fails to properly function. vShould this Y happen the wheel beingv .stitched would simply rotate and form the center circular stitching 45.

I claim:

l. In a device yof the character described,v

the combination with'a bed. of a slide movable thereover, feed mechanism on the slide,

and a reir rotatably secured to the bed adj acent the slide .mechanism and havingV a rack portion at one side, whereby rotation of the rod will'move the' rack into and out of engagement with the feed mechanism.y

2. In a devicefof the character described, a ybuff wheel support-ing slide having a bracket portion, a'fhollow worm rotatably l.secured to the bracket, and a guide rod securedI adjacent the'slide and passing through the worm to forma guide for the lslide in its movement. f n

3.y A buff wheel stitching attachment for sewing machines, including a slide having a buff wheel support and a hollow worm, gearing connecting the support and worm fory simultaneous rotation thereof, and a guide mem-berfor the partsv slidably engaged in the worm.

4. A buff wheel stitcher, including a stitching machine having a head and a work feed mechanism for engaging the wheel, a bed supporting the head having a slideway formed therein, a slide mounted therein, a rotatable buff wheel support carried by the slide, a feed worm also carried by the slide, gearing connecting the support and worm for simultaneous rotation, whereby as the buff wheel is turned through the action of the work feed mechanism the worm will be j turned, and a. rack carried by the bed and movable into and'out of engagement with the worm to controlthe feed of the slide on j rotation of the worm.

5. A bufl wheel stitcher including a bed supporting the head having a slideway formed therein` a slidemounted on the slideway having depending brackets, a hollow worm carried by the brackets, a rotatable buff wheel support on the slide, gearing connecting the support and worm, and a guide rod carried by the bed and passing'through the worm to hold the slide in place.

6. A buff wheel stitcher including a stitching machine having a head and a work feed mechanism, a bed ,supporting the head, a slide movable on the bed, said slide having a depending bracket portion, feed mechanism carried by the bracket, a rotatable work support on the slide, driving connections lie--v tween the feed mechanismk and the work .115

cluding a stitching head, a support therefor.

a slide on the .support movable toward and from the head, adjustable means for limiting the movement of the slide in one direction', and additional means for stopping said movement when the slide has reached a predetermined position in the opposite direction.

9. In a device oi2 the character described, the combination with a support, of a slide movable thereon havingdepending brackets, a rotatable Work Support on'the slide7 a sleeve rotatably supported by the 4brackets and havinzga Worm portion and a Vgear portion, driving` conneetionsbetween the Work support andthe gear on the sleeve,'a1id a guide rody sli'dably engaged in the sleeve and secured to the support to retain the slide in proper relation thereto.

l0. In a device of the character described, y

the combination With'a support, of a slide movable thereon having depending brackets,

a rotatable Work Support on 'the slide, a sleeve having a Worm portion'and a gear portion, said `sleeve being` rotatably supported by the' brackets,`a guide rod `slidably litting lWithin the Sleeve and secured to the' support to retain' the slide in proper relation to the Support,y and an adjustable stop on the rod for limiting 'the movement of the slide in yone direction.

In 'testimony whereof I have affixed Signature, in presence otWo-ivitnesses.

nani/irnos Pannes..

in y

VVitnesSes:

LoUrs S. GAGNON, Y Jo'raos PERRAS. 

